Well, my experience with the LTF-4A was this: bought two packs from Muziker.de; one had a likely defective “A” string which could not be installed without slipping several times on the peg, and ultimately snapped when tuning it quickly after a truss-rod adjustment (no strength reserve at all).Did you find the TIs lower tension than the LTFs? I really like the sound and feel of the TIs, but, as I said before, I play a bit harder, live, and found them to loose, but I guess it’s down to technique. I find that some strings suit different basses than others, my Precision sounds best with LaBellas 760FL, whereas the TIs or LTFs are more suited to my active Sadowsky and Warwick. Perhaps the clarity of the TIs works well with active basses?
Anyway, I agree that strings can make a major difference to the feel and sound of a bass, and for me it’s been worthwhile investment.
The second set was ok; this is the only model of LaBella I tried (planning to buy a set of long-scale Deep Talking Bass in the near future); they are by far the smoothest feeling flats I’ve tried and are definitely thumpy flatwound strings.
Their tension is similar to that of the D’Addario Chromes, probably a bit less; the tone is darker.
I’ve personally found that the low tension of the TI JF-344 strings is suitable for the typical cross-sectional dimensions of a J-bass neck; in terms of tone, they have more grit and that’s why I like them.
In Europe, we generally pay everything we import from the USA much more than if the same stuff was bought in the USA; this is actually not much due to the requirement of paying the import fees, but to the existence of VAT.
Consequently, when we talk about TI strings, being this one of the few worldwide renown bass-related items made in EU, I’m proud to state that in EU they are not very expensive (about 43€/pack).
LaBella strings, for example, are slightly more expensive than TI’s here; that’s why, on a rational and objective basis, it’s difficult to accept the old adagio according to which TIs are way too much money for the value they provide.
The rest is personal preference and taste, I guess.